PlateMate 1.25 lb. DONUT Pair - Magnetic Add-On Weights for Iron or Steel Pro-Style Dumbbells and Barbells Includes (2) Donut Shaped Magnetic Add-On Weights, 1.25 lbs each (2.5 lbs total for pair). Attaches to metal weights securely with super-strong magnet. Dumbbell NOT Included. Each 1.25 lb pair adds a total of 2.5 lb to ONE dumbbell or fixed weight barbell only. 4.5" (11.43cm) outside diameter, 1.8" (4.8cm) inside diameter, 0.5" (1.27cm) thickness. Will not magnetically stick properly to surfaces coated with rubber, urethane, neoprene, vinyl.